Steam-boiler



UNITED sTATEs PATENT soEErcE.

JAS. W. FARRELL, OF READING, PENNSYLVANIA.

STEA1VI-BOILER.

Specification of Letters Patent No. 8,955, dated May 18, 1852.

To @ZZ whom it may concern:

Be 1t known that I, JAMES W. FARRELL, of

l Reading, in the county of Berks and State Y of Steam-Engines, of which the following is a full, clear, and yexact description, reference being had to the accompanying drawing, which makes. part of this specification,

and which represents a sectional View of a portion of a locomotivenengine and of the tender with its water-tank.

My invention and improvement has for its l object the protection of the lire plates of the furnaces of steam boilers against the intense l heat of the burning fuel; and it consists in isolat-ing the lower portion of the water `space surrounding the furnace, from the rest of the boiler, and in` connecting it with the water tank by an open pipe or 4other channel, in such manner that the water of the tank is constantly in open and free communication with said isolated water space to keep the fire plates cool, the heat abstracted by the water from the plates being rendered available by feeding the heated water into the boiler. Y

The locomotive A and tender B represented in the accompanying drawings in their general external features are similar to those in common use. The boiler a being of the tubular variety, and surmounted by a steam dome b over the tire box c. In front of the sheet is a secondary combustion cham- Aber (Z supplied by a current of air entering through an opening e in itslbottom to complete the combustion of any inflammable gases that may escape from the fire box unburned. This secondary chamber of combustion is connected with the fire box or principal combustion chamber@ by a short tapering flue f. The fire box is surrounded by a water space g in the usual manner, but the lower portion g of this space `is separated from the upper portion by a diaphragm, or partition plate z' placed a foot more or less above the top of the grate bars. The lower portion g of the water space separated from the rest of the boiler, is connected by a pipe z. constantlyV open with the water tank lc of the tender B, which keeps it full of comparatively cool water that protects the inner or fire plates of this part of the boiler from the intense heat of the burning fuel adjacent to them.

In order that the heat abstracted from the lire plates by the water thus supplied from the tank may be rendered available in the generation of steam, this part of the water space is connected with the suction pipe m of the pump which feeds the boiler, and which draws the heated water out of the space g, to allow of its replacement by cooler water from the tank, to be in its turn heated and passed through the pump into the boiler.

In order that the coolest water may be left in contact with the fireplates, and the hottest pumped into the boiler, the supply pipe L from the tank 7c enters near the bottom, while. the discharge pipe m of the pump, communicates with the top o-f the space g. This arrangement not only provides for keeping the fire plates cool while the engine is in motion, but it also provides for keeping these plates cool when the engine is standing still, by the free circulation which will take place between the tank and the water space g through pipes it which connect them.

Various changes may be made in the form and arrangement of the parts to adapt them to diierent circumstances, or to suit the views of different constructors, as my invention is "not dependent upon either form or arrangement, so long as t-he lower part of the water space is kept isolated from the rest of the boiler, and in free and open commu` Isolating the lower `portion of the water i space surrounding the furnace, from the upper portion, and connecting it by a free` and constantly open communication With the In testimony whereof I have hereunto tank of feed Water, in such manner that the subscribed my name. feed Water of the tank Will circulate Without I f v 7 being forced by a pump in Contact With the JAS' V FARRELL' 5 re plates, to cool them, and to be itself Witnesses:

heated preparatoryto lbeing' pumped into JNO. F. BEATY,

the boiler, substantially as herein set forth. CHARLES D. FANIES. 

